JPH0557026B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vertical pulverizer that pulverizes cement raw materials, coal, chemicals, etc. by cooperation between a rotary table and rollers.

[Prior Art] Vertical pulverizers equipped with a rotary table and pulverizing rollers are widely used as a type of pulverizer for finely pulverizing granules such as cement raw materials, coal, and chemicals into powder. This type of crusher consists of a disk-shaped rotary table that is driven by a motor with a reducer to rotate at low speed in the lower part of a cylindrical casing, and a part that divides the outer circumference of the upper surface into equal parts in the circumferential direction, which is pressed by hydraulic pressure or the like. It is equipped with a plurality of rollers that are driven to rotate.

For example, in FIG. 2 showing a conventional vertical crusher, the crusher, which is designated as a whole by reference numeral 1, is visually formed as a single tower body, and at its base is a rotating shaft rotated by an electric motor (motor) 2. A table 3 is placed. A plurality of conical crushing rollers 4 are arranged to rotate in sliding contact with the rotary table 3, and the crushing rollers 4 are rotatably supported on a support arm 5. The support arm 5 is fixed to a support shaft 6 rotatably supported on the crusher side. One end of a rotating arm 7 is further fixed to this support shaft 6, and this rotating arm 7 extends downward through the side of a casing 8 surrounding the rotating table 3, and faces the lower space of the crusher. There is. The lower end of this rotating arm 7 is connected to the crusher 1
A pressure cylinder 9 whose lower end is rotatably supported on the base of the pressure cylinder 9 is rotatably supported on the tip of a rod 10.

The granules as a raw material supplied to the center of the rotary table 3 through the supply pipe 13 are caught between the driven roller 4 and the rotary table 3 by rotation of the table and are crushed. On the other hand, hot air is guided into the casing 8 by a duct (not shown), and this hot air blows up from the annular space 14 between the outer peripheral surface of the rotary table 3 and the inner peripheral surface of the casing 8. As a result, the fine powder rises inside the crusher 1 while being dried, and exits the discharge port 1 as a mixture with hot air.
5 and sent to the next process.

Note that some of the coarse particles also rise within the crusher 1, but are classified by the upper separator 15A and returned onto the rotary table 3.

Note that the rotary table 3 has a rotating shaft (not shown) extending vertically downward, and a reducer casing indicated by reference numeral 16 has a reducer casing that reduces the rotational force of the motor 2 to reduce the rotation of the rotary table 3. In addition to the speed reducer that transmits transmission to the shaft, a thrust bearing mechanism and a radial bearing mechanism are provided to support the rotary table 3 via its rotary shaft (none of which are shown).

Since this thrust bearing mechanism is intended to counteract the weight of the rotary table 3 and the pressing load of the rollers 4, it must be designed for large loads.
The structure had become complicated and unnecessarily bulky.

Therefore, an improved vertical crusher was proposed in which the weight of the rotary table and the pressure load of the rollers were directly transferred to the foundation (for example, Japanese Patent Publication No. 57-48974). FIG. 3 is a cross-sectional view of the main parts showing a schematic configuration of such a vertical crusher, in which the weight of the rotary table 3 and the pressing load of the rollers 4 are distributed from the flange portion 3B of the rotary table to the bearing 17 and the casing 16. directly to the foundation 18 via. Therefore, the rotating shaft 19 of the rotating table 3 does not require a thrust bearing mechanism, and the structure of the speed reduction mechanism can be simplified.

Note that reference numeral 20 in FIG. 3 is a gear fixed to the rotating shaft 19, and the motor rotational force is transmitted via a small gear 21 and a bevel gear 22.

[Problems to be Solved by the Invention] As mentioned above, even when the thrust load is directly borne by the foundation, the problem caused by the crushing of particles between the rotary table 3 and the rollers 4. The minute vibrations of the rotating plate are transmitted as high-frequency minute vertical vibrations to a speed reduction mechanism including gears 20, 21, and the like.

When the gear moves up and down due to such high-frequency minute vibrations, rotational slip and thrust (vertical) slip occur simultaneously on the tooth surfaces of the driving gear (gear 21 in Figure 3) and the passive gear (gear 20 in Figure 3). This causes wear and damage to the tooth surfaces, resulting in reduced durability of the reducer.

[Means for Solving the Problems] The present invention provides a rotary table having a dish part and a shaft part coaxially connected to the dish part on the lower side of the dish part, and a rotary table that can freely roll on the rotary table. a reduction gear having a crushing roller disposed in sliding contact with the shaft, a driven gear fixed to the shaft portion, a driving gear meshing with the driven gear, and a reduction gear casing in which the driving gear is pivotally supported; A vertical crusher is provided with a drive device that supplies power to the drive side gear via a power transmission member, and the rotary table is supported with respect to a foundation via a bearing. and a rotation prevention member that is suspended from the shaft portion by a bearing supported in a radial direction, and that locks the reducer casing to the foundation to prevent rotation of the reducer casing around the shaft portion. The invention is characterized in that a belt or a chain is used as the power transmission member.

[Function] In the vertical crusher of the present invention, the driven gear is fixed to the shaft portion. A driving gear that meshes with the driven gear is pivotally supported by a reducer casing, and this reducer casing is pivotally supported by the shaft portion by bearings that are supported in the thrust direction and the radial direction. Therefore, even if the rotary table vibrates up and down,
The driven and driving gears synchronize and vibrate up and down with the same amplitude, causing wear on the tooth surfaces of both gears.
Damage is extremely reduced and the durability of the reducer is increased.

[Example] Examples will be described below with reference to the drawings.

FIG. 1 is a sectional view of a main part of a vertical crusher according to an embodiment of the present invention.

In FIG. 1, the rotary table 3 includes a dish portion 31
and a shaft portion 32. Connecting flange parts 33 and 34 are integrally provided at the lower and upper ends of the dish part 31 and the shaft part 32, respectively, and both flanges 33 and 34 are fixed with bolts 35.

A bearing 43 (described later) is provided on the lower surface of this flange 34.
is locked, and the rotary table 3 is directly supported on the foundation 18. That is, a ring-shaped support plate 41 is fixed at a predetermined height on the inner peripheral surface of the casing 40 of the vertical crusher rising from the foundation 18, and a support stand is installed on the upper surface side of the inner peripheral edge of the plate 41. A bearing 4 is provided between the bearing 42 and the flange 34.
3 is interposed, whereby the rotary table 3 is directly supported on the base 18. Reference numeral 44 is a leg member that reinforces the support plate 41.

FIG. 4 is an enlarged sectional view showing the bearing 43 and its surrounding structure. The bearing 43 is a retainer 43
a, 43b, and steel balls 4 are provided in the two circumferential grooves.
3c is interposed, and by locking this steel ball 43c to the upper or lower surface of the groove, the load in the thrust direction is supported by the support base 42 side.

Note that reference numeral 43d is a retaining ring fixed to the lower surface side of the flange 34 by bolts 43e, and the bearing is held between the retaining ring 43g fixed to the support base 42 by bolts 43f.

Next, the configuration of the reducer 50 will be explained. Reference numeral 51 is a reduction gear casing, and an opening 52 is provided on one side. A worm wheel 53 fixedly attached to the shaft portion 32 by a mounting member 32a and a bolt 32b is housed in the casing 51, and a worm 54 that meshes with the worm wheel 53 is pivoted with respect to the casing 51. has been done.

Thus, the casing 51 is suspended from the boss portion 53a of the worm wheel 53 via bearings 55 and 56. The code 57 is the casing 5
A support shaft 58 that is fixed to the bottom of the lower casing and protrudes downward is pivotally supported by the foundation 18 via a bearing 59. This bearing 59 is a radial bearing that provides substantially only support in the circumferential direction.

An arm 60 is provided to protrude laterally from the lower casing 57, and an opening 6 formed in the arm 60 is provided.
1, a rod 62 rising from the foundation 18 is inserted, thereby preventing the speed reducer 50 from rotating together with the shaft portion 32.

Note that the worm 54 is connected to the motor output side by a V-belt 63.

The other configuration of the device of this embodiment is substantially the same as the conventional device shown in FIG. 2, and the roller 4 is urged in the direction of pressing against the table surface by an appropriate pressing mechanism such as a hydraulic cylinder. There is. Furthermore, an annular space 14 is defined below the table surface of the rotary table 3 by the partition plates 70, 71, 72, 73, etc., and the hot air introduced from the inlet 74 flows around the rotary table 3. Pass through to grinding room 7
It is configured to be introduced within 5. Note that reference numeral 76 is a guide vane for making the direction of the wind introduced into the crushing chamber 75 into the twisting direction. Further, numeral 77 is a window for discharging particles that have fallen into the annular space 14, and is covered by an opening/closing lid 78.

Although not shown, the upper part of the apparatus is equipped with a separator, a discharge pipe for the pulverized material to be transported by air flow, and the like.

In the vertical crusher having such a configuration, the raw material placed on the rotary table 3 is rotated by the motor driving force transmitted through the V-belt 63, the worm 54, and the worm wheel 53.
and the roller 4 driven by the rotary table 3, and the pulverized material is carried by the hot air, and the fine powder is sent out of the device as it is, while the coarse powder is transported inside the device. It is sorted by the upper separator and falls onto the rotary table 3.

As the rotation of the rotary table 3 and the rollers 4 causes pulverization, high-frequency minute vibrations are generated on the shaft portion 32.
In this embodiment, since the reducer 50 is suspended from the rotary table 3, the worm 54 and the worm wheel 53 vibrate with substantially the same amplitude and the same period. Become,
Wear and damage on those tooth surfaces becomes extremely small.

Since substantially all of the load of the rotary table 3 and the pressing load of the rollers 4 are directly supported by the foundation 18 via the bearings 43, there is no need for a thrust bearing in the reducer 50 to support these loads. Yes, the structure of the reducer can be simplified.

In addition, in the above embodiment, a worm gear mechanism and a V-belt are used as the speed reduction mechanism and the power transmission mechanism, but other gear speed reduction devices may also be used.
Also, a chain can be used instead of the V-belt.

[Effects] As described above, according to the present invention, even if high-frequency minute vibrations are propagated to the speed reduction mechanism, wear and damage caused to the gears of the speed reducer are minimal, resulting in longer life of the gears and high durability of the speed reducer. Improvements can be realized and maintenance can be simplified.

Furthermore, since no special bearings are required, manufacturing is easy and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main parts of a vertical crusher according to an embodiment, FIGS. 2 and 3 are sectional views of a conventional device, and FIG.
The figure is an enlarged sectional view of the main part of FIG. 1. 3...Rotary table, 4...Crushing roller, 31...Dish section, 32...Shaft section, 50...Reducer.

Claims (1)

[Scope of Claims] 1. A rotary table having a dish portion and a shaft coaxially connected to the dish portion below the dish portion, and a pulverizer disposed in sliding contact with the rotary table so as to be able to roll freely. A speed reducer having a roller, a driven gear fixed to the shaft, a driving gear meshing with the driven gear, and a reducer casing in which the driving gear is pivotally supported, and transmitting power to the driving gear. A vertical crusher comprising: a drive device that applies power through a member; and the rotary table is supported to a foundation via a bearing; A rotation preventing member is installed to suspend from the shaft portion by means of the rotor, and to lock the reducer casing to the foundation to prevent rotation of the reducer casing around the shaft portion. A vertical crusher characterized by using a belt or chain as a power transmission member.